High-pressure growth of fluorine-free SmFeAsO$_{1-x}$ superconducting single crystals (2008)
Lee, Hyun-Sook, Park, Jae-Hyun, Lee, Jae-Yeap, Sung, Nak-Heon, Kim, Ju-Young, Cho, B. K., ...
Superconducting single crystals of SmFeAsO$_{1-x}$ without fluorine doping were grown at a pressure of 3.3 GPa and a temperature of 1350-1450 $^\circ$C by using the self-flux method. Plate-like...
Multiple-source optical spectral weight transfer in ferromagnetic EuB6 (2007)
Kim, Jungho, Cho, B. K., Kim, Young-June, Choi, E. J.
We present the first wide range (2 meV$-$5.5 eV) optical conductivity of EuB$_6$ from reflectivity and ellipsometry measurements. Upon the ferromagnetic transition at T$_{c}$=15.5 K, interband...
Anisotropy and Penetration Depth of MgB$_{2}$ from ${}^{11}$B NMR (2006)
Chen, Bo, Sengupta, Pratim, Halperin, W. P., Sigmund, E. E., Mitrovic, V. F., Lee, M. H., ...
The ${}^{11}$B NMR spectra in polycrystalline MgB$_2$ were measured for several magnetic fields (1.97 T and 3.15 T) as a function of temperature from 5 K to 40 K. The composite spectra in the...
Optical spectroscopy study on the electronic structure of $Eu_{1-x} Ca_x B_6$ (2004)
Kim, Jungho, Lee, Youngwoo, Choi, E. J., Homes, C. C., Rhyee, Jong-Soo, ...
The optical conductivity $\sigma_{1}(\omega)$ of Eu$_{1-x}$Ca$_{x}$B$_{6}$ has been obtained from reflectivity and ellipsometry measurements for series of compositions, $0\leq x\leq 1$. The interband...
YbGaGe: normal thermal expansion (2004)
Janssen, Y., Chang, S., Cho, B. K., Llobet, A., Dennis, K. W., McCallum, R. W., ...
We report evidence of the absence of zero thermal expansion in well-characterized high-quality polycrystalline samples of YbGaGe. High-quality samples of YbGaGe were produced from high-purity...
Cho,B. K., Jain,A., Nieberle,J., Mahajan,S., Wiesner,U., Gruner,S. M., ...
Formation of mid-gap states and ferromagnetism in semiconducting CaB$_6$ (2003)
Rhyee, Jong-Soo, Oh, B. H., Cho, B. K., Jung, M. H., Kim, H. C., Yoon, Y. K., ...
We present a consistent overall picture of the electronic structure and ferromagnetic interaction in CaB$_6$, based on our joint transport, optical, and tunneling measurements on high-quality {\em...
Cho, B. K., Kim, Jae Hoon, Kim, Young Jin, O, Beom-hoan, Kim, J. S., Stewart, G. R.
Temperature-dependent magnetization (M(T)) and specific heat (C_p(T)) measurements were carried out on single crystal Sm_{1.85}Ce_{0.15}CuO_{4-delta} (T_c = 16.5 K). The magnetic anisotropy in the...
Phenomenological Theory of Superconductivity and Magnetism in Ho$_{1-x}$Dy$_x$Ni$_2$B$_2$C (1999)
Doh, Hyeonjin, Sigrist, Manfred, Cho, B. K., Lee, Sung-Ik
The coexistence of the superconductivity and magnetism in the Ho$_{1-x}$Dy$_x$Ni$_2$B$_2$C is studied by using Ginzburg-Landau theory. This alloy shows the coexistence and complex interplay of...
Yang, In-Sang, Klein, M. V., Cooper, S. L., Canfield, P. C., Cho, B. K., Lee, Sung-Ik
Superconductivity-induced changes in the electronic Raman scattering response were observed for the RNi$_2$B$_2$C (R = Y, Lu) system in different scattering geometries. In the superconducting state,...
Point-contact-spectroscopy evidence of quasi-particle interactions in RNi2B2C (R=Ho, Y). (1997)
Yanson, I. K., Fisun, V. V., Jansen, A. G. M., Wyder, P., Canfield, P. C., Cho, B. K., ...
Oxx, S., Choudhury, D. P., Willemsen, Balam A., Srikanth, H., Sridhar, S., Cho, B. K., ...
Measurements of the rf penetration depth \lambda(T,H,\theta ) are used to study the superconducting order parameter, vortex dynamics in the mixed state and delineate critical fields in the...
Microwave Properties of Borocarbide Superconductors LnNi2B2C (Ln = Y, Er, Tm, Ho) (1995)
Jacobs, T., Willemsen, Balam A., Sridhar, S., Nagarajan, R., Gupta, L. C., Hossain, Z., ...
We report measurements of the microwave surface impedance of the borocarbide family of superconductors LnNi2B2C (Ln=Y, Er, Tm, Ho). The experiments enable direct measurements of the superfluid...